Hydraulic Pressure Tests: Notes
WARNING: This page is about a different variant/trim than selected.
NOTE:
Before preforming the hydraulic pressure tests be certain to disconnect the Variable Line Pressure (VLP) electrical connector at the transmission. Check for and clear any codes that may have been set after preforming any hydraulic pressure test and connecting the Variable Line Pressure (VLP) electrical connector.
| 1 - TORQUE CONVERTER CLUTCH OFF |
| 2 - REVERSE |
| 3 - LOW/REVERSE |
| 4 - 2/4 |
| 5 - UNDERDRIVE |
| 6 - TORQUE CONVERTER CLUTCH ON |
| 7 - OVERDRIVE |
Pressure testing is a very important step in the diagnostic procedure. These tests usually reveal the cause of most transmission problems.
Before performing pressure tests, be certain that fluid level and condition, and shift cable adjustments have been checked and approved. Fluid must be at operating temperature (150 to 200 degrees F.).
Install an engine tachometer, raise vehicle on hoist which allows the wheels to turn, and position tachometer so it can be read.
Using special adapters L-4559, attach 300 psi gauge(s) C-3293SP to the port(s) required for test being conducted.
Test port locations are shown in the Pressure Taps illustration.